Update bleve dependency to latest master revision (#6100)

* update bleve to master b17287a86f6cac923a5d886e10618df994eeb54b6724eac2e3b8dde89cfbe3a2

* remove unused pkg from dep file

* change bleve from master to recent revision

vendor/github.com/blevesearch/bleve/mapping/reflect.go

@@ -35,6 +35,9 @@ func lookupPropertyPath(data interface{}, path string) interface{} {
 
 func lookupPropertyPathPart(data interface{}, part string) interface{} {
 	val := reflect.ValueOf(data)
+	if !val.IsValid() {
+		return nil
+	}
 	typ := val.Type()
 	switch typ.Kind() {
 	case reflect.Map: